A straight is 5 consecutive cards of any suit
Straight Flush 5 consecutive cards of the same suit
Royal Flush ace, king, queen, jack, ten of the same suit
Also note if you get into a game with wildcards, 5 of a kind will beat a Royal Flush. And it's always your top 5 cards that count if you're playing 7 card Stud. 7 card straights count only as a straight. The two extra cards don't count.
Wikipedia entry on poker in general: http://en.wikipedia.org/wiki/Poker - pretty general. Mostly good for sending you to other, more specific articles such as:
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